Add array cast to pointer

[edg-l]

Also fixes some GEPs that were not entirely correct, it now uses the gep using the array type and not the array element type.

mod Main {
    pub extern fn puts(data: *mut char) -> i32;

    pub fn main() -> i32 {
        let x: [char; 13] = ['h','e','l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', '!', '\0'];
        let z: *mut char = x as *mut char;
        puts(z);
        return 0;
    }
}

[github-actions[bot]]

Benchmarking factorial

Compiling factorial (factorial.con) Finished release in 29.313253ms Running 5000000 iterations Using input value: 20 Concrete Result = 2432902008176640000 Time taken : 59.25 ms Rust Result = 2432902008176640000 Time taken : 60.13 ms

Benchmarking fib

Compiling fib (fib.con) Finished release in 26.030158ms Running 5000 iterations Using input value: 20 Concrete Result = 6765 Time taken : 137.29 ms Rust Result = 6765 Time taken : 85.25 ms

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.03226% with 26 lines in your changes are missing coverage. Please review.

Project coverage is 61.97%. Comparing base (56a8221) to head (a849920). Report is 6 commits behind head on main.

Files	Patch %	Lines
crates/concrete_codegen_mlir/src/codegen.rs	78.99%	25 Missing :warning:
crates/concrete_ir/src/lib.rs	75.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #131 +/- ## ========================================== + Coverage 61.71% 61.97% +0.25% ========================================== Files 25 25 Lines 4532 4610 +78 ========================================== + Hits 2797 2857 +60 - Misses 1735 1753 +18 ```

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